EVAL-ADXL346Z

Manufacturer Part NumberEVAL-ADXL346Z
DescriptionInertial Sensor Evaluation System
ManufacturerAnalog Devices Inc
EVAL-ADXL346Z datasheets
 

Specifications of EVAL-ADXL346Z

Silicon ManufacturerAnalog DevicesSilicon Core NumberADXL346
Kit Application TypeSensing - Motion / Vibration / ShockApplication Sub TypeAccelerometer
Silicon Family NameIMEMSLead Free Status / RoHS StatusLead free / RoHS Compliant
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FEATURES
Ultralow power: as low as 23 μA in measurement mode and
0.2 μA in standby mode at V
= 2.6 V (typical)
S
Power consumption scales automatically with bandwidth
User-selectable resolution
Fixed 10-bit resolution
Full resolution, where resolution increases with g range,
up to 13-bit resolution at ±16 g (maintaining 4 mg/LSB
scale factor in all g ranges)
Patent pending, embedded memory management system
with FIFO technology minimizes host processor load
Single-tap/double-tap detection
Activity/inactivity monitoring
Free-fall detection
Concurrent four- and six-position orientation detection
Supply and I/O voltage range: 1.7 V to 2.75 V
2
SPI (3- and 4-wire) and I
C digital interfaces
Flexible interrupt modes mappable to either interrupt pin
Measurement ranges selectable via serial command
Bandwidth selectable via serial command
Wide temperature range (−40°C to +85°C)
10,000 g shock survival
Pb free/RoHS compliant
Small and thin: 3 mm × 3 mm × 0.95 mm LGA package
APPLICATIONS
Handsets
Medical instrumentation
Gaming and pointing devices
Industrial instrumentation
Personal navigation devices
Hard disk drive (HDD) protection
ADXL346
3-AXIS
SENSOR
Rev. A
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
3-Axis, ±2 g/±4 g/±8 g/±16 g
Ultralow Power Digital Accelerometer
GENERAL DESCRIPTION
The ADXL346 is a small, thin, ultralow power, 3-axis accelerometer
with high resolution (13-bit) measurement at up to ±16 g. Digital
output data is formatted as 16-bit twos complement and is acces-
sible through either an SPI (3- or 4-wire) or I
The ADXL346 is well suited for mobile device applications. It
measures the static acceleration of gravity in tilt-sensing appli-
cations, as well as dynamic acceleration resulting from motion
or shock. Its high resolution (4 mg/LSB) enables measurement
of inclination changes of less than 1.0°.
Several special sensing functions are provided. Activity and
inactivity sensing detect the presence or lack of motion by
comparing the acceleration on any axis with user-set thresholds.
Tap sensing detects single and double taps in any direction. Free-
fall sensing detects if the device is falling. Orientation detection
is capable of concurrent four- and six-position sensing and a
user-selectable interrupt on orientation change for 2D or 3D
applications. These functions can be mapped individually to
either of two interrupt output pins. An integrated, patent pending
memory management system with 32-level first in, first out (FIFO)
buffer can be used to store data to minimize host processor activity
and lower overall system power consumption.
Low power modes enable intelligent motion-based power
management with threshold sensing and active acceleration
measurement at extremely low power dissipation.
The ADXL346 is supplied in a small, thin, 3 mm × 3 mm ×
0.95 mm, 16-lead, plastic package.
FUNCTIONAL BLOCK DIAGRAM
V
S
POWER
MANAGEMENT
CONTROL
SENSE
ADC
AND
DIGITAL
ELECTRONICS
INTERRUPT
FILTER
LOGIC
32-LEVEL
SERIAL I/O
FIFO
GND
CS
Figure 1.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
ADXL346
2
C® digital interface.
V
DD I/O
INT1
INT2
SDA/SDI/SDIO
SDO/ALT
ADDRESS
SCL/SCLK
www.analog.com
©2010 Analog Devices, Inc. All rights reserved.

EVAL-ADXL346Z Summary of contents

  • Page 1

    FEATURES Ultralow power: as low as 23 μA in measurement mode and 0.2 μA in standby mode 2.6 V (typical) S Power consumption scales automatically with bandwidth User-selectable resolution Fixed 10-bit resolution Full resolution, where resolution increases ...

  • Page 2

    ADXL346 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 General Description ......................................................................... 1 Functional Block Diagram .............................................................. 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 5 Thermal Resistance ...................................................................... 5 Package Information .................................................................... 5 ESD Caution.................................................................................. 5 Pin ...

  • Page 3

    SPECIFICATIONS T = 25° 2 1.8 V, acceleration = I/O Table 1. Specifications Parameter SENSOR INPUT Measurement Range Nonlinearity Inter-Axis Alignment Error 3 Cross-Axis Sensitivity OUTPUT RESOLUTION All g ...

  • Page 4

    ADXL346 Parameter TEMPERATURE Operating Temperature Range WEIGHT Device Weight 1 All minimum and maximum specifications are guaranteed. Typical specifications are not guaranteed. 2 The typical specifications shown are for at least 68% of the population of parts and are based ...

  • Page 5

    ABSOLUTE MAXIMUM RATINGS Table 2. Parameter Acceleration Any Axis, Unpowered Any Axis, Powered I/O Digital Pins All Other Pins Output Short-Circuit Duration (Any Pin to Ground) Temperature Range Powered Storage Stresses above those listed under Absolute ...

  • Page 6

    ADXL346 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 5. Pin Function Descriptions Pin No. Mnemonic I SCL/SCLK SDA/SDI/SDIO 7 SDO/ALT ADDRESS INT2 INT1 12 ...

  • Page 7

    TYPICAL PERFORMANCE CHARACTERISTICS –150 –100 –50 0 ZERO g OFFSET (mg) Figure 4. X-Axis Zero g Offset at 25° –150 –100 –50 0 ZERO g ...

  • Page 8

    ADXL346 –3 –2 –1 ZERO g OFFSET TEMPERATURE COEFFICIENT (mg/°C) Figure 10. X-Axis Zero g Offset Temperature Coefficient –3 –2 –1 ZERO g OFFSET TEMPERATURE ...

  • Page 9

    SENSITIVITY (LSB/g) Figure 16. X-Axis Sensitivity at 25° 2.6 V, Full Resolution 230 240 250 260 270 SENSITIVITY ...

  • Page 10

    ADXL346 100 –0.10 –0.05 0 SENSITIVITY TEMPERATURE COEFFICIENT (%/°C) Figure 22. X-Axis Sensitivity Temperature Coefficient, V 100 –0.10 –0.05 0 ...

  • Page 11

    SELF-TEST SHIFT ( g ) Figure 28. X-Axis Self-Test Response at 25° –1.0 –0.9 –0.8 –0.7 –0.6 ...

  • Page 12

    ADXL346 THEORY OF OPERATION The ADXL346 is a complete 3-axis acceleration measurement system with a selectable measurement range of ±2 g, ±4 g, ± ± measures both dynamic acceleration resulting from motion or shock and static ...

  • Page 13

    POWER SAVINGS Power Modes The ADXL346 automatically modulates its power consumption in proportion to its output data rate, as outlined in Table 7. If additional power savings is desired, a lower power mode is available. In this mode, the internal ...

  • Page 14

    ADXL346 SERIAL COMMUNICATIONS and SPI digital communications are available. In both cases mode is enabled if the CS pin the ADXL346 operates as a slave The CS pin should always be tied high ...

  • Page 15

    CS t DELAY SCLK t t SETUP HOLD W MB SDI t SDO SDO DELAY SCLK t t HOLD SETUP R MB SDI t SDO SDO DELAY SCLK t t SETUP HOLD R/W MB ...

  • Page 16

    ADXL346 Table 9. SPI Digital Input/Output Parameter Digital Input Low Level Input Voltage ( High Level Input Voltage ( Low Level Input Current ( High Level Input Current ( Digital Output Low ...

  • Page 17

    I C With CS tied high the ADXL346 I/O requiring a simple 2-wire connection as shown in The ADXL346 conforms to the UM10204 I and User Manual, Rev. 03—19 June 2007, available ...

  • Page 18

    ADXL346 2 Table 12 Timing (T = 25° 2 Limit Parameter Min f SCL 100 ...

  • Page 19

    INTERRUPTS The ADXL346 provides two output pins for driving interrupts: INT1 and INT2. Both interrupt pins are push-pull, low impedance pins with the output specifications listed in Table 13. The default configuration of the interrupt pins is active high. This ...

  • Page 20

    ADXL346 Overrun Bit The overrun bit is set when new data replaces unread data. The precise operation of the overrun function depends on the FIFO mode. In bypass mode, the overrun bit is set when new data replaces unread data ...

  • Page 21

    SELF-TEST The ADXL346 incorporates a self-test feature that effectively tests its mechanical and electronic systems simultaneously. When the self-test function is enabled (via the SELF_TEST bit (Bit D7 in the DATA_FORMAT register, Address 0x31), an electrostatic force is exerted on ...

  • Page 22

    ADXL346 REGISTER MAP Table 19. Register Map Address Hex Dec Name 0x00 0 DEVID 0x01 to 0x1C Reserved 0x1D 29 THRESH_TAP 0x1E 30 OFSX 0x1F 31 OFSY 0x20 32 OFSZ 0x21 33 DUR 0x22 34 Latent 0x23 ...

  • Page 23

    REGISTER DEFINITIONS Register 0x00—DEVID (Read Only The DEVID register holds a fixed device ID code of 0xE6 (346 octal). Register 0x1D—THRESH_TAP (Read/Write) The THRESH_TAP register is eight bits and holds ...

  • Page 24

    ADXL346 ACT_x Enable Bits and INACT_x Enable Bits A setting of 1 enables x-, y-, or z-axis participation in detecting activity or inactivity. A setting of 0 excludes the selected axis from participation. If all axes are excluded, the function ...

  • Page 25

    When clearing the link bit recommended that the part be placed into standby mode and then set back to measurement mode with a subsequent write. This is done to ensure that the device is properly biased if sleep ...

  • Page 26

    ADXL346 Register 0x31—DATA_FORMAT (Read/Write SELF_TEST SPI INT_INVERT 0 FULL_RES The DATA_FORMAT register controls the presentation of data to Register 0x32 through Register 0x37. All data, except that for the ±16 g range, must be clipped ...

  • Page 27

    Register 0x39—FIFO_STATUS (Read Only FIFO_TRIG 0 FIFO_TRIG Bit the FIFO_TRIG bit corresponds to a trigger event occurring, and a 0 means that a FIFO trigger event has not occurred. Entries Bits These ...

  • Page 28

    ADXL346 Register 0x3C—Orient (Read Only 2D_ORIENT V3 Vx Bits These bits show the validity of the 2D (V2) and 3D (V3) orienta- tions. A value of 1 corresponds to the orientation being valid. ...

  • Page 29

    APPLICATIONS INFORMATION POWER SUPPLY DECOUPLING A 1 μF tantalum capacitor ( and a 0.1 μF ceramic capacitor placed close to the ADXL346 supply pins is I/O DD I/O recommended to adequately ...

  • Page 30

    ADXL346 INVALIDATES DOUBLE TAP IF SUPRESS BIT IS SET TIME LIMIT FOR TAPS LATENCY TIME WINDOW FOR SECOND (DUR) TIME (LATENT) TAP (WINDOW) Figure 46. Double-Tap Event Invalid Due to High g Event When the Suppress Bit Is Set A ...

  • Page 31

    THRESHOLD The lower output data rates are achieved by decimating a common sampling frequency inside the device. The activity, free-fall, and single-tap/double-tap detection functions without improved tap enabled are performed using undecimated data. As the bandwidth of the output data ...

  • Page 32

    ADXL346 output in full-resolution is 3 one-quarter of an LSB of the offset register. Because the offset register is additive, the 0 g values are negated and rounded to the nearest LSB of the offset register ...

  • Page 33

    ... If the device is oriented such that the projection of gravity onto all three axes is nonzero, the effective sensitivity is reduced, causing an increase in the dead zone angle. Therefore, evaluation needs to be performed for specific appli- cation uses to determine the optimal setting for the dead zone. 52.7° ...

  • Page 34

    ADXL346 Writing to the BW_RATE register or placing the part into standby mode resets the orientation feature, clearing the orientation filter and the orientation status. These actions cause an orientation interrupt (if enabled), however, if the orientation during the next ...

  • Page 35

    NOISE PERFORMANCE The specification of noise shown in Table 1 corresponds to the typical noise performance of the ADXL346 in normal power opera- tion with an output data rate of 100 Hz (LOW_POWER bit = 0, rate = 0x0A in ...

  • Page 36

    ADXL346 Changes in noise performance, self-test response, and supply current are discussed elsewhere throughout the data sheet. For more information about noise performance, review the Noise Performance section. The Self-Test section discusses both the operation of self-test over voltage (a ...

  • Page 37

    AXES OF ACCELERATION SENSITIVITY Figure 59. Axes of Acceleration Sensitivity (Corresponding Output Increases When Accelerated Along the Sensitive Axis OUT Y = –1g OUT OUT +1g OUT Y ...

  • Page 38

    ADXL346 LAYOUT AND DESIGN RECOMMENDATIONS Figure 61 shows the recommended printed wiring board land pattern. Figure 62 and Table 27 provide details about the recommended soldering profile. T Table 27. Recommended Soldering Profile Profile Feature Average Ramp Rate from Liquid ...

  • Page 39

    ... PLANE ORDERING GUIDE Measurement 1 Model Range (g) ADXL346ACCZ-R2 ±2, ±4, ±8, ±16 ADXL346ACCZ-RL ±2, ±4, ±8, ±16 ADXL346ACCZ-RL7 ±2, ±4, ±8, ±16 EVAL-ADXL346Z EVAL-ADXL346Z-DB EVAL-ADXL346Z-M EVAL-ADXL346Z RoHS Compliant Part. 3.10 3.00 SQ PIN 1 2.90 0.10 0.50 13 BSC 0.50 9 BOTTOM VIEW TOP VIEW 0.275 1 ...

  • Page 40

    ADXL346 NOTES refers to a communications protocol originally developed by Philips Semiconductors (now NXP Semiconductors). Analog Devices offers specific products designated for automotive applications; please consult your local Analog Devices sales representative for details. Standard products sold ...